I love Fortelling! It has a beautiful interface, thorough prompts in its templates, and it's really convenient and easy to use. I'm also a fan of its predecessor, Writing Tools. It inspired me to try to make my own apps!
I also wanted to ask, did you make this app in Android Studio? The UI is really impressive.
I've been using fortelling for as long as it's around and i enjoy using it even at times when i'm not actively writing any conventional story. It's always been helpful to all my story projects, no matter if they were supposed to be books, games, or whatever else. And it's constantly coming up with very helpful improvements and cool features.
It's a great app for world building, goal setting, and drafting your projects. Whether it be DnD, novel writing, or fan fiction, this is the app you want to have on your mobile device to keep it all in one place and organized.